JP2010174810A - Horizontal engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal engine inhibiting vibration of a starter cover, preventing generation of noise by the vibration and improving durability of a boss part of a starter motor. <P>SOLUTION: The engine 1 is provided with: an engine body 2, the starter motor 50 arranged on a front face of the engine body 2, a flywheel 40 arranged on a side face of the engine body 2 and provided for rotation by the starter motor 50; and a fuel tank 30 arranged on an upper part of the engine body 2. In the engine 1, the starter motor 50 is received by an almost box-shaped starter cover 60 opening toward an engine body 2 side, an upper part of the starter cover 60 is fixed to a tank stay 31 supporting and fixing the fuel tank 30 to the engine body 2, one of the right and left sides of the starter cover 60 is fixed to a starter bracket 70 supporting and fixing the starter motor 50, and the other of the right and left sides of the starter cover 60 is fixed to a cylinder block 4 via a stay 80. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a horizontal engine, and more particularly to a technology of a starter cover and a starter bracket provided in the horizontal engine.

  2. Description of the Related Art Conventionally, in a horizontal engine, a technique in which a starter motor for starting an engine is attached to the front portion of an engine body is known. Specifically, the front portion of the engine body is covered with a front lid, and the front lid is provided with a stay that protrudes forward and has a circular opening in a side view. The starter motor is formed in a cylindrical shape, and one end side of the starter motor is inserted into and supported by the opening of the stay, whereby the starter motor is attached to the front lid (for example, see Patent Document 1). ).

  And the technique in which a starter motor is accommodated by a starter cover is known. Specifically, as shown in FIG. 10, in the horizontal engine 100, the starter cover 160 formed in a substantially box shape has a starter motor 150 placed inside the starter cover 160 with the opening side facing the engine body. Stored. Then, bolts 110 and 110 are screwed inward from the front surface of the starter cover 160 and fastened to a boss portion of the starter motor 150 housed in the starter cover 160, and the starter cover 160 is fixed to the starter motor 150. ing.

JP 2008-2317 A

  However, in the conventional starter cover, since the bolts for fastening and fixing the starter cover to the starter motor are arranged in the vertical direction of the starter cover so as to be approximately near the center, the starter cover is provided with the starter motor. The starter cover vibrates with the bolt as a node (a position where the starter cover does not move due to vibration). Therefore, there are problems in that noise is generated by vibration and durability of the boss portion of the starter motor is lowered.

  The present invention has been made in view of the above-described problems, and a problem to be solved is to suppress the vibration of the starter cover, prevent the generation of noise due to the vibration, and the starter motor. It is an object of the present invention to provide a horizontal engine that can improve the durability of the boss portion.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, an engine main body, a starter motor disposed on a front surface of the engine main body, a flywheel disposed on a side surface of the engine main body and rotatably provided by the starter motor; In a horizontal engine including a fuel tank disposed on an upper portion of the engine body, the starter motor is accommodated by a substantially box-shaped starter cover that opens toward the engine body side, and the upper portion of the starter cover is The fuel tank is fixed to a tank stay that supports and fixes the engine body, the left and right sides of the starter cover are fixed to a starter bracket that supports and fixes the starter motor, and the left and right other sides of the starter cover are fixed to the stay. It is fixed to the cylinder block via

  According to a second aspect of the present invention, the starter bracket is formed between the flywheel and the cylinder block, and an extending portion that extends forward of the engine body is formed on a side surface of the extending portion. The starter motor is supported and fixed, and a starter cover attaching portion is formed at a front portion of the extending portion.

  According to a third aspect of the present invention, the outside of the flywheel is covered with a flywheel cover, and the front portion of the flywheel cover is formed with a bulging portion that covers a side portion of the starter motor.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect, the vibration of the starter cover can be suppressed. Therefore, generation of noise due to vibration can be prevented, and durability of the boss portion of the starter motor can be improved.

  According to the second aspect, in addition to the effect of the first aspect, the cost can be reduced by sharing the parts.

  In the third aspect, in addition to the effect of the second aspect, noise can be further reduced.

1 is a perspective view showing an overall configuration of a horizontal engine according to an embodiment of the present invention. Similarly, the perspective view which showed the attachment structure of the starter bracket of a horizontal engine. Similarly, the right side view of a horizontal engine. Similarly, a front view of a horizontal engine. (A) The front view of a starter cover. (B) The right view of a starter cover. (A) Left side view of starter bracket. (B) The starter bracket viewed from the direction of arrow A. The BB arrow directional view of the starter bracket shown in FIG. Side surface sectional drawing of a stay. The left view of a flywheel cover. The perspective view which showed the whole structure of the conventional horizontal engine.

Next, embodiments of the invention will be described.
In the following, the front and rear directions are defined with the direction indicated by the arrow F in the figure as the front. Further, a direction perpendicular to the front-rear direction and the horizontal direction is defined as a left-right direction.

  First, an overall configuration of an engine 1 that is an embodiment of a horizontal engine according to the present invention will be described.

  As shown in FIGS. 1 to 4, the engine 1 includes a cylinder head 3 and a cylinder block 4, and a cooling water tank 20 and a fuel tank 30 provided thereon to constitute an engine body 2. In the engine body 2, a cylinder head 3 is provided on the rear side of the cylinder block 4, the front side of the cylinder block 4 is covered with a front lid 7, and an oil pan for storing lubricating oil below the cylinder block 4. 10 is attached. A bonnet 6 is attached to the rear side of the cylinder head 3, and the inside of the bonnet 6 is used as a valve arm chamber to constitute a valve operating mechanism. Support legs 8 and 8 that support the engine body 2 are attached below the cylinder block 4 and before and after the oil pan 10.

  On the other hand, on the upper side of the engine body 2, the fuel tank 30 and the cooling water tank 20 are arranged in the front-rear direction, and the front lower portion of the fuel tank 30 is fixed to the cylinder block 4 via the tank stay 31. Yes. A lifting bolt 14 serving as a locking portion when the engine 1 is lifted is provided at a substantially central portion of the upper surfaces of the tanks 20 and 30. The tank stay 31 is provided with a boss portion (not shown), and a starter cover 60 described later is supported and fixed by a bolt or the like.

  Further, an air cleaner 13, a silencer 12, an exhaust muffler 11, and the like are disposed at the rear part of the engine body 2, and a fuel filter 32 and the like are disposed at the front part of the engine body 2. A starter motor 50 for starting is fixedly provided via a starter bracket 70. That is, a starter bracket 70 in which a circular opening 73 (see FIG. 6) is formed in a side view is extended forward from the left side surface of the engine body 2, and a cylindrical shape is formed in the opening 73 of the starter bracket 70. The one end side of the starter motor 50 configured as described above is supported in an inserted state.

  The cylinder block 4 is provided with a lubricating oil pump (not shown) for sending the lubricating oil of the oil pan 10 to each part of the engine 1. The lubricating oil pump is driven by a crankshaft 5 described later via a power transmission mechanism. A gear case 9 is attached to the right side of the cylinder block 4, and a crank gear, a cam gear, a lubricant pump drive gear, and the like (not shown) are accommodated in the gear case 9.

  A crankshaft 5 is rotatably supported by the cylinder block 4 in the left-right direction on the engine body 2. Further, a flywheel 40 is provided at one side (left side) outer end portion of the crankshaft 5, and when the engine 1 is started, the flywheel 40 is rotated to accumulate rotational energy for easy start. Stabilizes the rotation of the crankshaft 5. The outside of the flywheel 40 is covered with a flywheel cover 41.

  Next, the configuration of the starter bracket 70 will be described in more detail.

The starter bracket 70 supports the starter motor 50 and supports the left and right sides (left side in the present embodiment) of a starter cover 60 described later.
As shown in FIGS. 6 and 7, the starter bracket 70 includes a base 71 and an extension 72.

  The base portion 71 is a portion that is attached to the cylinder block 4, has a shape that follows the outer shape of the flywheel 40, and is disposed between the flywheel 40 and the cylinder block 4. In the base 71, bolt holes 74, 74,... For fastening and fixing the starter bracket 70 to the cylinder block 4 with bolts or the like are opened at appropriate intervals along a plurality of peripheries.

  The extension portion 72 extends forward from the base portion 71 in order to attach the starter motor 50 and support one side of the starter cover 60, and the extension portion 72 is disposed in a state of protruding forward from the engine body 2. Is done. An opening 73 is formed at the center of the extension 72, and a boss 77, a bolt hole 75, and a bolt hole 76 are provided above and below the opening 73.

  As described above, the opening 73 is supported in a state where one end side of the cylindrical starter motor 50 is inserted. The opening 73 is formed in a circular shape in a side view and is opened in the left-right direction so that the output shaft of the starter motor 50 can pass therethrough.

  The boss portion 77 is an example of a starter cover mounting portion, and the boss portion 77 is below the front end portion of the extension portion 72, and as shown in FIG. The front is opened and a female screw is formed on the inner surface. The bolt hole 64 provided in the lower left portion of the starter cover 60 is aligned with the boss portion 77 and fastened and fixed to the starter bracket 70 with a bolt or the like, thereby supporting the left side of the starter cover 60.

  The bolt holes 75 and 75 are provided above and below the extension part 72 with the opening 73 interposed therebetween, and are provided outside (above and below) the bolt holes 76 and 76. The bolt holes 75 and 75 are used to fasten and fix a flywheel cover 41 (described later) to the starter bracket 70 with bolts or the like.

  Similarly to the bolt holes 75 and 75, the bolt holes 76 and 76 are provided on the upper and lower sides of the extension portion 72 with the opening 73 interposed therebetween. The bolt holes 76 are for fastening and fixing the starter motor 50 to the inside of the starter bracket 70 with bolts or the like.

  Further, as shown in FIG. 7, the starter bracket 70 has a stepped shape in which the base 71 and the extending portion 72 are bent in two steps in a plan sectional view, and is shifted in the left-right direction. Specifically, an inclined portion extending obliquely outward from a front end portion of a base portion 71 provided in the front-rear direction of the engine 1 is provided, and an extending portion 72 extends from the front end portion of the inclined portion in the front-rear direction of the engine 1. It is configured to extend forward. In this way, noise is prevented from leaking from between the front part of the flywheel 40 and the cylinder block 4. Further, the lower end portion of the base portion 71 is provided with a convex portion 71a toward the outside, so that noise or the like does not leak from between the starter bracket 70 and the lower cover 48 (see FIG. 2) covering the inner lower side of the flywheel 40. ing.

  Conventionally, as shown in FIG. 10, in order to reduce noise leaking from the gap between the flywheel cover 141 and the starter bracket 170, a separate structure from the starter bracket 170 is provided on the back side of the front portion of the flywheel 140. In the present invention, the back cover 180 is provided and the gap is eliminated. In the present invention, the function of the back cover 180 is fulfilled by the starter bracket 70 according to the present invention, and the back cover 180 is not provided.

  Next, the configuration of the starter cover 60 will be described in more detail.

  The starter cover 60 is formed in a substantially box shape that opens toward the engine main body 2, and houses the starter motor 50 inside the starter cover 60.

  As shown in FIG. 5, the starter cover 60 is provided with bolt holes 65, 67, 64, and 66 and protruding pieces 61 around the periphery.

The protruding piece 61 is formed to protrude outward from the lower end of the rear end of the left side surface of the starter cover 60. A bolt hole 64 is opened in the front-rear direction at a substantially central portion of the protruding piece 61.
The bolt hole 64 is disposed on the same axis as the boss portion 77 of the starter bracket 70, and the left side of the starter cover 60 is fastened and fixed to the starter bracket 70 with a bolt or the like. Accordingly, the left side of the starter cover 60 is supported by the starter bracket 70 including the boss portion 77.

  The bolt hole 65 is provided in a hook-like portion extending vertically upward from the rear end portion of the upper surface of the starter cover 60. A plurality of bolt holes 65 are opened in the front-rear direction (two places in the present embodiment), are arranged on the same axis as the boss portion provided in the tank stay 31, and the upper portion of the starter cover 60 is disposed on the tank. The stay 31 is fastened and fixed with bolts or the like. Accordingly, the upper portion of the starter cover 60 is supported by the tank stay 31.

  The bolt hole 66 is opened in the left-right direction below the right side surface of the starter cover 60. The bolt hole 66 is used to fasten and fix the right side of the starter cover 60 to a stay 80 described later with a bolt or the like. Thus, the left side of the starter cover 60 is supported by the cylinder block 4 via the stay 80 and the front lid 7.

As shown in FIG. 8, the stay 80 is formed in a substantially L shape in a plan sectional view by a side plate 81 and a support plate 82, and the front cover of the front portion of the cylinder block 4 is directed in the longitudinal direction. 7 is arranged.
Bolt holes 84 and 84 are opened in the side plate 81 in the front-rear direction. The bolt holes 84 and 84 are used to fasten and fix the stay 80 to the front lid 7 with bolts or the like. On the other hand, a projecting portion is formed on the lower side of the support plate 82, and a bolt hole 83 is opened in the left-right direction. The bolt hole 83 is disposed in the same axial direction as the bolt hole 66 of the starter cover 60 and the bolt, and the stay 80 is fastened and fixed to the starter cover 60 with a bolt or the like.

  In addition, bolt holes 67, 67, 67 are opened on the front surface of the starter cover 60. The bolt holes 67, 67, and 67 are used to fasten and fix the starter cover 60 to a boss portion (not shown) of the starter motor 50 housed in the starter cover 60 with bolts or the like.

As described above, the engine body 2, the starter motor 50 disposed on the front surface of the engine body 2, and the flywheel 40 disposed on the side surface of the engine body 2 and rotatably provided by the starter motor 50. And a fuel tank 30 disposed in the upper part of the engine body 2, the starter motor 50 is accommodated by a substantially box-shaped starter cover 60 that opens toward the engine body 2 side. The upper part of 60 is fixed to a tank stay 31 that supports and fixes the fuel tank 30 to the engine body 2, and the left and right sides of the starter cover 60 are fixed to a starter bracket 70 that supports and fixes the starter motor 50. The left and right other sides are fixed to the cylinder block 4 via stays 80.
Thus, the outer periphery (right side, upper part, left side) of the starter cover 60 is supported and fixed, so that it is possible to suppress the starter cover 60 from resonating with the vibration generated by the starter motor 50. Therefore, generation of noise due to vibration can be prevented, and the durability of the boss portion of the starter motor 50 can be improved.

In addition, as described above, the starter bracket 70 is formed between the flywheel 40 and the cylinder block 4 and has an extension 72 that extends forward of the engine body 2. A starter motor 50 is supported and fixed on the side surface, and a boss portion 77 which is a starter cover mounting portion is formed at the front portion of the extension portion 72.
As a result, the starter bracket 70 can fulfill the function of the back cover 180, so that the back cover 180 and the starter bracket 70 can be made common to reduce the number of parts and the cost.

  Next, the configuration of the flywheel cover 41 will be described in detail.

The flywheel cover 41 covers the flywheel 40 from the outside as described above.
As shown in FIG. 9, the flywheel cover 41 is formed in a substantially circular shape in a side view, and is provided with an opening 42 that opens toward the outside at the center, and an output shaft (crankshaft) is provided from the opening 42. ) Can be projected. On the outer periphery of the flywheel cover 41, a bulging portion 43 and a plurality of projecting portions 44, 45, 46, and 47 are provided so as to project.

  The bulging portion 43 covers the side portion of the starter motor 50. Specifically, one end side of the starter motor 50 is supported in a state of being inserted into the opening 73 of the starter bracket 70, and a pinion is provided at the end of the output shaft that protrudes outward from the inserted opening 73. Since the pinion is fixedly engaged with a gear provided on the flywheel, the bulge 43 of the starter bracket 70 is covered together with the starter bracket 70 from the outside of the pinion and the output shaft in a substantially sealed state.

  Conventionally, as shown in FIG. 10, the end of the starter motor 50 is covered with a cover 190 which is a member different from the flywheel cover 41. In the present invention, the function of the cover 190 is used. The flywheel cover 41 according to the present invention fulfills the above and the cover 190 is not provided.

  Bolt holes 44a, 45a, 46a, and 47a are opened in the left and right directions of the plurality of projecting portions 44, 45, 46, and 47, respectively. The bolt holes 44a, 45a, 46a, and 47a are used to fasten and fix the flywheel cover 41 to the starter bracket 70 and the engine body 2 with bolts or the like.

The protrusions 44 and 45 are arranged vertically with the bulging part 43 interposed therebetween. The bolt holes 44a and 45a of the projecting portions 44 and 45 are arranged on the same axis as the bolt holes 76 and 76 of the starter bracket 70, respectively.
The protrusions 46 and 47 are arranged at appropriate positions at equal intervals from the protrusions 44 and 45, respectively. The bolt holes 46a and 47a of the protrusions 46 and 47 are not provided in the engine body 2, but are arranged on the same axis as the bolt holes (not shown).

As described above, the outside of the flywheel 40 is covered with the flywheel cover 41, and the front portion of the flywheel cover 41 is integrally formed with a bulging portion 43 that covers the side portion of the starter motor 50. Is.
As a result, the flywheel cover 41 can fulfill the function of the cover 190 of the output part of the starter motor 50. Therefore, the cover 190 and the flywheel cover 41 can be shared, the number of parts can be reduced, and the cost can be reduced. . Further, by covering the side portion of the starter motor 50 with a single member, the gap can be reduced and noise can be reduced.

DESCRIPTION OF SYMBOLS 1 Engine 2 Engine main body 4 Cylinder block 7 Front cover 20 Cooling water tank 30 Fuel filter 31 Tank stay 40 Flywheel 41 Flywheel cover 42 Opening part 50 Starter motor 60 Starter cover 70 Starter bracket 80 Stay

Claims (3)

The engine body,
A starter motor disposed on the front surface of the engine body;
A flywheel disposed on a side surface of the engine body and rotatably provided by the starter motor;
In a horizontal engine comprising a fuel tank disposed on an upper portion of the engine body,
The starter motor is housed by a substantially box-shaped starter cover that opens toward the engine body.
The upper part of the starter cover is fixed to a tank stay that supports and fixes the fuel tank to the engine body,
The left and right sides of the starter cover are fixed to a starter bracket that supports and fixes the starter motor,
The left and right other sides of the starter cover are fixed to the cylinder block via a stay.
This is a horizontal engine. The starter bracket is disposed between the flywheel and the cylinder block, and an extending portion is formed to extend forward of the engine body.
The starter motor is supported and fixed to the side surface of the extension part,
The horizontal engine according to claim 1, wherein a starter cover attachment portion is formed at a front portion of the extension portion. The outside of the flywheel is covered with a flywheel cover,
The horizontal engine according to claim 2, wherein a bulge portion that covers a side portion of the starter motor is formed at a front portion of the flywheel cover.

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